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https://issues.apache.org/jira/browse/HDFS-7433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14536688#comment-14536688
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Hudson commented on HDFS-7433:
------------------------------
SUCCESS: Integrated in Hadoop-Mapreduce-trunk #2138 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2138/])
HDFS-7433. Optimize performance of DatanodeManager's node map. Contributed by
Daryn Sharp. (kihwal: rev 7a7960be41c32f20ffec9fea811878b113da62db)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> Optimize performance of DatanodeManager's node map
> --------------------------------------------------
>
> Key: HDFS-7433
> URL: https://issues.apache.org/jira/browse/HDFS-7433
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Labels: BB2015-05-TBR
> Fix For: 2.8.0
>
> Attachments: HDFS-7433.patch, HDFS-7433.patch, HDFS-7433.patch,
> HDFS-7433.patch
>
>
> The datanode map is currently a {{TreeMap}}. For many thousands of
> datanodes, tree lookups are ~10X more expensive than a {{HashMap}}.
> Insertions and removals are up to 100X more expensive.
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